CVE-2024-51053
📋 TL;DR
This vulnerability allows attackers to upload malicious files to AVSCMS v8.2.0 through the /main/fileupload.php component, potentially leading to remote code execution. Any organization using the vulnerable version of AVSCMS is affected. Attackers can compromise the entire system by uploading crafted files.
💻 Affected Systems
- AVSCMS
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the web server, data exfiltration, and lateral movement to other systems.
Likely Case
Webshell deployment leading to persistent backdoor access, data theft, and potential ransomware deployment.
If Mitigated
File upload attempts blocked or sanitized, preventing code execution while maintaining normal functionality.
🎯 Exploit Status
Simple file upload exploitation with public proof-of-concept available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Restrict file upload access
allBlock access to /main/fileupload.php via web server configuration or firewall rules.
# Apache: RewriteRule ^/main/fileupload\.php$ - [F,L]
# Nginx: location ~ /main/fileupload\.php$ { deny all; }
Implement file upload validation
allAdd server-side validation to restrict file types, extensions, and content.
# Add to fileupload.php: $allowed_extensions = ['jpg', 'png', 'pdf']; $file_extension = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION)); if (!in_array($file_extension, $allowed_extensions)) { die('Invalid file type'); }
🧯 If You Can't Patch
- Implement WAF rules to block malicious file upload patterns.
- Monitor file upload directories for suspicious files and implement file integrity monitoring.
🔍 How to Verify
Check if Vulnerable:
Check if /main/fileupload.php exists and accepts file uploads without proper validation.Check Version:
Check AVSCMS version in configuration files or admin panel.Verify Fix Applied:
Test file upload functionality with malicious files to ensure they are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /main/fileupload.php
- Files with suspicious extensions (.php, .phtml, .jsp) in upload directories
- Large number of upload requests from single IP
Network Indicators:
- POST requests to /main/fileupload.php with file attachments
- Outbound connections from web server to unknown IPs after uploads
SIEM Query:
source="web_logs" AND uri="/main/fileupload.php" AND method="POST" AND size>1000000